How to set default checked option in many2many checkbox widget

Question

Odoo 13
I am looking to change what is selected by default in a many2many checkbox widget but I am unsure of where this is done.
In my case the second option is checked by default but I would like the third and fourth option to be checked by default instead. In Odoo it is inside an inventory tab in the product template form in the inventory module but I am unsure where it is set in the code.

Chris TRINGHAM · Accepted Answer

It can be done using Automated Actions.  For example, to default Routes on stockable products [1] :
Model = Product Template Action To Do = Execute Python Code Trigger Condition = On Creation Apply On: Use domain to select which products are updated. In this example, we are only only updating stockable / storable products, though you might want to include consumables as well.   Python Code In this example, we are selecting Buy (5) and Make to Order (1). Multiple routes are selected by entering t

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